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UK Spec for Malaysia Driving Condition
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<blockquote data-quote="rpmnut" data-source="post: 504258" data-attributes="member: 20757"><p>From what I've read on forums and mags about the infamous swirl flaps on BMW diesels, these flaps close at low engine rpm's to do two things:</p><p></p><p>(i) Aid combustion at low engine rpm's by "swirling" intake air to encourage better fuel atomisation - this has a nice side-effect of improving driveability by bumping up torque at low rpm's; and</p><p>(ii) They aid emissions control by reducing the production of soot from diesel combustion in the absence of assisted induction from the turbo at low rpm's..</p><p></p><p>You're right though, in that the moment you open the throttle, the flaps open fully, so in everyday driving, you probably won't feel any difference. </p><p></p><p>The flaps are programmed to open fully beyond 2250 rpm, subject to the ECU registering the following parameters:</p><p></p><p>DDE5.0/DDE6.3</p><p>The swirl flaps generally open when</p><p>* the coolant temperature < 14 °C OR</p><p>* the amount of fuel > 24 mg OR</p><p>* engine speed > 2250 rpm OR</p><p>* the intake temperature < -5 °C</p><p></p><p>You can order blanking plates to replace the troublesome flaps on-line.</p><p></p><p>You can see a vid of the flaps here:</p><p></p><p>[video=youtube;PU3PykUSjH4]http://www.youtube.com/watch?v=PU3PykUSjH4&feature=related[/video]</p></blockquote><p></p>
[QUOTE="rpmnut, post: 504258, member: 20757"] From what I've read on forums and mags about the infamous swirl flaps on BMW diesels, these flaps close at low engine rpm's to do two things: (i) Aid combustion at low engine rpm's by "swirling" intake air to encourage better fuel atomisation - this has a nice side-effect of improving driveability by bumping up torque at low rpm's; and (ii) They aid emissions control by reducing the production of soot from diesel combustion in the absence of assisted induction from the turbo at low rpm's.. You're right though, in that the moment you open the throttle, the flaps open fully, so in everyday driving, you probably won't feel any difference. The flaps are programmed to open fully beyond 2250 rpm, subject to the ECU registering the following parameters: DDE5.0/DDE6.3 The swirl flaps generally open when * the coolant temperature < 14 °C OR * the amount of fuel > 24 mg OR * engine speed > 2250 rpm OR * the intake temperature < -5 °C You can order blanking plates to replace the troublesome flaps on-line. You can see a vid of the flaps here: [video=youtube;PU3PykUSjH4]http://www.youtube.com/watch?v=PU3PykUSjH4&feature=related[/video] [/QUOTE]
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